even though the caucuses on tuesday, the texas congressman plans to head home for the weekend. the latest evidence of his unconventional approach for winning the gop nomination. as for the other candidates, no surprise, many are taking verbal shots at each other. we have the details. >> it's a mad dash to the finish line. the iowa caucuses are still up for grabs. a new poll shows mitt romney and ron paul in a tight race for the top spot. then it's a bare-knuckle fight to win the bronze. the an dates are aiming their attacks at the one just ahead of them in the policy. rick perry is hitting rick santorum. >> senator santorum loaded up his bills with pork. >> santorum slamming paul. >> and this is the dangerous thing paul represents. >> and paul going after romney. but for the last month everyone has attacked newt gingrich and it's had a major effect. he's gone from first to fifth in just a few weeks. according to one analyst, nearly half the ads that ran this month focused on gingrich and the vast majority were negative. >> i think politics has become a nasty, vicious, negative